Josh Hamilton made one thing clear: The Texas Rangers will forget their stunning season-ending sweep at Oakland and regroup as an American League wild card.
So much for a third straight AL West crown. Texas needed one win against the upstart Athletics in three games, and didn't get it.
"You guys have a hard time believing we can forget about it and move ahead," Hamilton said. "But that's what we get paid to do. We'll go home, regroup and go figure out what we have to do."
The Athletics captured the AL West with another improbable rally in a season full of them, coming back from four runs down and a 13-game division deficit to stun the two-time defending league champion Rangers 12-5 on Wednesday.
Hamilton dropped a fly ball in center field for a two-run error that put the A's (94-68) ahead 7-5 in a six-run fourth inning. The A's only added to Texas' troubles the rest of the way.
"You can have all the experience as you want but when you run into a team that's hot, experience has nothing to do with it," Rangers manager Ron Washington said.
While Texas (93-69) is headed to the new one-game, wild-card playoff, the A's get some time off before opening the division series in their first postseason appearance since 2006.
Both teams had to wait to learn their opponents from a pair of night games: Boston at New York, and Baltimore at Tampa Bay.
The A's would earn the AL's No. 1 seed if the Yankees lose, and open the division series at the winner of Friday's wild-card playoff featuring the Rangers. If New York wins, Oakland would be the No. 2 seed and begin at Detroit.
Texas squandered a five-game division lead in the final nine days.
"We knew this is a beast of a team we would have to beat, and to be able to beat them three games in a row and win the division on top of it, really it's a magical type thing," manager Bob Melvin said.
Grant Balfour retired Michael Young on a fly to center for the final out, then raised his arms in the air as the A's streamed out of the dugout and began bouncing up and down in the infield.
Oakland pulled off another remarkable performance in a season defined by thrilling walkoffs, rallies and whipped-cream pie celebrations by a team that was never supposed to be here.
The A's trailed Texas by 13 games on June 30.
Coco Crisp hit a tying two-run double in the fourth against loser Derek Holland (12-7) and Brandon Moss drove in three runs, including a two-run single in the four-run eighth.
Rookie winning pitcher Evan Scribner (2-0) left the mound in the sixth to a standing ovation from the sellout crowd of 30,067. He allowed two hits and struck out two in three scoreless innings after replacing struggling starter A.J. Griffin.
Ryan Cook, pitching for a fifth consecutive game, gave up a double to Nelson Cruz before retiring the next three Texas hitters with strikeouts of David Murphy and Mike Napoli. Catcher Derek Norris pumped his right arm as the Coliseum fans jumped to their feet.
Norris then homered leading off the bottom of the eighth for his second RBI. It was his seventh homer and Oakland's majors-leading 112th since the All-Star break.
Hamilton's miscue while charging forward might haunt the to-be free agent if his Rangers don't get past their wild-card game.
"I just missed it, man," Hamilton said.
Murphy's two-run single highlighted a five-run third inning that put Texas in prime position.
In the fourth, Moss drew a leadoff walk and Josh Reddick followed with an RBI double. Josh Donaldson singled and Seth Smith's base hit made it 5-3 and chased Ryan Dempster with none out and runners on first and second.
Washington turned to the lefty Holland, a starter who was tagged for four runs in the first inning of the second game of Sunday's doubleheader with the Angels before working into the seventh.
He retired the first two batters before Crisp's double down the right-field line.
The only other teams to come back from at least 13 games down to win the division were the 1914 Boston Braves, the 1951 New York Giants, the '78 Yankees and the '95 Seattle Mariners.